writing a file:newbie question

[kavitha thankaian]

Hi,
   
  i have a file test.txt and it contains a list of strings say,,,
   
  "a","b","c","d","a1","b1","c1","d1","a2","b2","c2","d2",
   
  i would like to write the file as
   
  "a","b","c","d"
  "a1","b1","c1","d1
  "a2","b2","c2","d2"
   
  and would like to delete the comma at the end.
   
  if soneone knows pls help me,,,
   
  kavitha

                                
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